Electrical phonograph apparatus



Dec. l, 1931. M. E. vANslcKLE 1,834,359

ELECTR ICAL PHONOGRAPH APPARATUS Filed March 1'7, 1927 2 Sheets-Sheet 125 Y T ,Y I HYVENTOR, 7 f/ZWZ mw/; 35 34 y BY ATTORNEY Decl, 1931- M. E.vANslcKLE 1,834,359

ELECTRICAL PHONOGRAPH APPARATUS Filed March 1'7I 1927 2 Sheets-Sheet 2jrs. 5 UE; 5

IN VEN TOR.

@falkag Vafzs Z631 BY y ATToRNE Patented Dec. 1, 1931 UNITED STATESPATENT oFFlcE MELVIN VANSICKLE, OF NEXARK, NEW JERSEY, ASSIG-NOR T0BRANDES LABORA- TORIES, INC., OF NEWARK, NEW JERSEY, A CORPORATION OFNEW'J'ERSEY ELECTRICAL PHONOG-RAPI-I APPARATUS Applicatibn mea Maren 17,1927. seriaiNo. 176,089.

My invention relates broadly to electrical phonograph pickup devices andmore'` particularly` to an electromagnetic phonograph pick-up device.. Yv y A @ne ofthe objects of my invention is to provide a construction ofelectrical phonograph pick-up device comprising a'relatively smallnumber of parts assembled in acompact manner for actuation by the stylusof the phonograph for securing relatively large changes in the magneticcondition of an electromagnetic winding for controlling an electron tubeamplification system at relatively large amplitude.

Another object of my invention is'to provide a construction ofelectromagnetic actuator for velectrical phonographs in which anarmature member is mounted within an electromagnetic winding foractuation by the stylus of a phonograph for effecting changes Y in themagnetic condition of the electromagneticv winding in accordance with asound record. I 4

Another object of my invention is to provide'a construction ofelectrical phonograph pick-up device in whichan armature member in theform of a pedestal is rockablyl mountedrwithin an electromagneticwinding,"the armature member being flanged intermediate the ends thereofto allow the resilient-setting of the, armature within the vcasing fofthe pick-up Vdevice in a position in which vibrations from a stylus maybe readily transferred to the. armature.

Another object of my invention is'to provide a construction ofelectrical phonograph pick-up device in which an armature member iscaused to be rockably mounted within' an electromagnetic winding and incor-operation with a stylus in such manner that the armature member maybe vibrated in either of' two directions. according as the stylus isrequired to follow vertically` orlaterally formed sound records.

Other and still further objects of my in-l vention reside .in theconstruction and arrangement of parts for the electrical phonographpick-up as described in the following specication and illustrated in theaccompanying drawings, in which:

f Figure 1 is side elevation of a phonograph showing the electricalpick-up of my n invention in' positionon the phonograph; Fig. 2 is alongitudinal cross-sectional view taken' through the electricalphonograph pick-up; Fig.`3 is a cross-sectional view taken 'von line 3-3of Fig. 2; Fig.: t is alateral crosssectional view taken through thephonograph pick-up on line 4-41 of Fig. 3*; F ig'. 5 is a lateralcross-sectional view taken through the :electrical phonograph pick-up on]ine 5-5 of Fig. 3; Fig. 6 is a cross-sectional view taken through theelectrical phonograph pick-up on 'line 66 of Fig. 2 ;,Fig. 7 shows thearrangement of pole members by which the upper end of the armature iscontrolled; and Fig. 8 is a side elevation of the armature member em-'Vployed in the electricalv phonograph pick-up of my invention. Y,

Referring to the drawings in more detail,

reference character 1 illustrates the phonograph which is equipped Vwiththe electrical pick-up of my invention. Reference character 2 indicatesthe revolvable record table for the phonograph arranged to carry record3 over which the arm 4: is arranged to swing. Theelectrical phonographpick-up device is illustrated' at 5 as 4comprising a supporting member 7and socket member 6 which may fit into the end of the arma. A permanentmagnet 8 is positioned with respect to the sup-l porting member 7 bymeans of a clamping 'strip`9 and"'scrfew member 10. I provide a pair ofpole pieces 11 and 12 between the poles of the permanent magnet 8, thepole pieces terminating in arcuate shaped pole faces 84 and 85 onopposite sides of thearmature'member 19 andare secured in positionby'means of screw members 111 and V15 which extend through thesupporting member 7 A resilient pad 16 is positioned withv respect to aspacerplate V17 and'upper resilient pad 18as represented: in Figd andbetween the vresilient pads 16 and 18 the armature member 19 is centeredand-resilientlysupported, the flange 20 thereof being gripped on itsopposite faces by the resilient pads 18 and 16. The armature member 19has one end thereof reduced and formed in polygonal cross secvtion .asrepresented at 21. V'A resilient sleeve 22 fits over the polygonalportion 21 of the armature 19 and forms an abutment for the pole pieces23 and 24 which are adjustable upon the pole members 11 and 12 by meansof screws 23a and 24a operating in slots 235 and 24?). The coil support26 is mounted between the pole members 11 and 12 and the pole pieces 23and 24. This coil support has a hollow core through which the armature19 passes. An electromagnetic winding 25 is carried by the coil support26 and is subjected to changes in its magnetic condition in ac-.cordance with vibrations of the armature member developed by movementimparted thereto from the stylus 30 which is mounted and secured in thesocket member 29 by means ofadjustable set screw 31.

It will thus be seen that the armature member 19 is adapted to bevibrated in either of two planes according as the stylus .30 is requiredto follow a vertically formed sound track or a laterally formed soundtrack of the sound record. The pole pieces 23 and 24 are so arrangedwith respect to the `armature member 19 that the lines of magnetic fluxwill be varied in accordance with the vibration of the varmature memberirrespective of the plane in which the vibration is set up.

The entire assembly is housed within the cover portion 27 securedthrough the strip 9 by means of screw members 2.8 forming a dust proofcasing for the phonograph pickup. Conductors 36 lead from theelectromagnetic winding 25 through the socket 6 to suitable contactmembers by which they may be plugged into cooperating sockets in thephonograph arm 4 for establishing con-nection with the electron tubeamplification apparatus which may be positioned within the phonographcabinet.

VThe electrical phonograph piclcup of my invention comprises arelatively small number of parts thereby facilitating manufacture andproduction and decreasing the manufacturing cost.

While I have described the invention in its preferred embodiment, Idesire it to be understood that modications may be made and that nolimitations are intended other than are imposed by the scope of theappended claims. j Y

What I claim as new and desire to secure by Letters Patent of the UnitedStates is as follows: V

l. An electrical phonograph pick-up comprising a supporting member, apermanent magnet carried by said supporting member, a pair of polepieces positioned between the poles of said permanent magnet, said polepieces terminating in arcuate shaped pole faces directed toward eachother, at one end and having pole faces cut on opposite angles posedwithin an electromagnetic winding and having a circular cross-sectionthroughout a portion of its length and a polygonal cross-sectionadjacent the end thereof, whereby said pole faces conform to the contourof said armature, and a stylus carried in the end of said armaturemember for transferring vibrations to said armature member and variablycontrolling the magnetic condition of said electromagnetic winding.

2. An. electrical phonograph pickup comprising a supporting member, apermanent magnet carried by said supporting member, a pai-rof polepieces positioned between the poles of said permanent magnet, said polepieces terminating in arcuate shaped pole faces directed toward eachother at one end and angularly formed pole faces at the opposite end, anelectromagnetic winding positioned between said pole pieces, an armaturemember having an integral flange intermediate the ends thereof with aportion of its length circular in cross-section and a portion thereofpolygonal in cross-section, whereby said pole faces closely conform tothe contour of said armature, means secured to said supporting memberfor resiliently gripping opposite sides of said flange for positioningsaid armature member within said electro- 4viagnetic winding, a styluscarried in one end of said armature memberv for displacing said armaturemember within said electromagnetic winding and effecting a change in themagnetic condition thereof.

3. An electrical phonograph pick-up comprising a supporting member, apermanent magnet carried by said supporting member, a pair of polemembers positioned between the poles. of said permanent magnet, saidpole members having arcuate shaped pole vfaces directed toward eachother, a pair of adjustable pole faces secured to the opposite ends ofsaid pole members, a cylindrical armature member having an integrallyconnected fiange intermediate the ends thereof, means for resilientlygripping opposite faces of said flange in a position adjacent saidarcuate shaped pole faces, said armature member carrying a stylus at'oneend and projecting beyond said adjustable pole faces at Vthe oppositeends of said pole members, and an electromagnetic winding positionedbetween said pole members and said adjustable pole faces andconcentrically positioned about said armature member whereby vibrationsof said stylus in either of two planes angulariy disposed to one anotherwhen imparted to said armature member will effect changes in themagnetic condition of said electromagnetic winding. Y

4. An electrical phonograph pick-up comprising a supporting member, apermanent magnet carried by said supporting member, a pair of polemembers positioned between the poles of said permanent magnet, said polethrough members terminating in arcuate shaped pole faces, a pair ofadjustable pole faces positioned upon the opposite ends of said polemembers, an electromagnetic winding loc-ated between said pole members,an armature member having a cylindrical body portion and an integrallyconnected cylindrical flange, means gripping opposite faces of saidflange for rockably mounting said armature member between said polefaces and within said electromagnetic winding, one end of said armaturemember carrying a stylus and the opposite end of said armature havingend portions thereof shaped to conform to the portion of said amatureadj acent thereto so that equal movements of said armature in saiddirections cause substantially equal changes of magnetic flux in saidarmature.

In testimony whereof I affix my signature.

MELVIN E. VANSICKLE.

member having a polygonal shape and being Y covered by a sleeve ofresilient material arranged to be centered between correspondinglyshaped pole faces of said adjustable pole members, whereby vibrations ofsaid stylus in either of two planes angularly disposed to one anotherwhen imparted to said armature member will effect changes in themagnetic condition of said electromagnetic winding.

5. In a phonograph pick-up device having a magnetic circuit, thecombination of, a pair of pole pieces forming a part of said magneticcircuit, an armature disposed in a gap between said pole pieces andmounting means for said armature to allow movement thereof in said gapin directions to reproduce vertically and laterally cut records in thesame posit-ion of the device relative to the records.

6. In a phonograph pick-up device having a magnetic circuit, thecombination of, a pair of pole pieces in said magnetic circuit formingtwo gaps therein, an armature passing one of said gaps and having an endportion thereof disposed in the other of said gaps, said end portionhaving a substantially square cross section and each of said pole piecesbeing shaped to conform to two sides of said end portion, and means formounting said armature to allow movement thereof in two directionsrelative to said pole pieces.

7. In a phonograph pick-up device having a magnetic circuit, thecombination of, lan

armature forming a part of said magnetic circuit, mounting means toallow movement of said armature in two directions substantiallyperpendicular to each other, apair of pole pieces forming another partof said magnetic circuit and a gap therein, an end portion of saidarmature disposed in said gap, and end portions of said pole piecesshaped with respect to said armature end portion so that equal movementsof said armature in said directions produce substantially equal changesof magnetic iiux in said armature.

8. In a phonograph pick-up device having an armature disposed in a gapbetween two poles of a magnetic circuit, means for mounting saidarmature to allow movement thereof in either of two directions relativeto said poles, said directions being substantially perpendicular to eachother and said pole pieces

